This guy is confusing me. Help?

This guy started flirting with me and I fell for him. He rejected a relationship with me once before. Now months later we met and I react to him still (as I still have feelings). And he has started teasing me about my reactions and says stuff that trigger my affection (I'll come closer to you/ just for you/I make you nervous) But now he is asking for a confession? He is nagging me to tell him the reason behind my behavior?

Why does he keep teasing me about my feelings for him and why does he want me to confess my feelings
This guy is confusing me. Help?
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